Is no problem as a screw, but I think as you are little variations in the size of the head.
We use to make a washer in the counterbore with drill but will enter the mono of other manufacturers but at or did not enter or entered whether this product is a little large, I cut the head with each time lathe.
I want to expect improvement.

Available, free of charge the parts to the local high school rifle shooting part. To the assembly of the various parts that you create by cutting the aluminum material is not essential M5 of the hexagon socket head bolts.

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All of the products MonotaRO Singapore offers are subject to Japanese local laws, regulations, and certification standards.
Please make sure that it may or may not meet requirements of your country and/or international organizations,
including but not limited to, UL Certification, China Compulsory Certificate system, and Halal.
MonotaRO Co.,Ltd. Hyogo Public Safety Commission No.631330800020